Clamp



Jan. 17, 192s. 1,656,325

J. M. HARGRAVE A, 'CLAMP Filed July 5. 1927 y Ama/ffm? Wwf/.

Patented Jan. 17, 1928.k i

OFFICE.

JOHN M. `HARGiunta,loF CINCINNATI, oHio.

CLAMP.

Application filed July 5,

This invention relates to clamps and is particularly directed to the construction of the clamping jaws thereof. j

In the ktype of clainp herein concerned the clamping aws for engaging the work eX- tend out a considerable distance from the longitudinal connecting bar `on which they are mounted. Substantial length for vthe clamping jaw arins is necessary in order io to give the proper clearance for the worlr being adjusted and clamped between these 'jaws The work is clamped between and engages the extreme outer ends of the jaws.

When irregular work is clamped` between the i5 jaws the work thrusts are often laterally exerted onthe jaws so that it is necessary to take `care of these torques to prevent distorting of the clanip jaws.

Itis the object of this invention to take care of these work strains, torques and tlirusts'thrown on the outer or work engaging jaw ends through proper disposition of strengthening ribs.

It is another object of this invention to provide a clamping jaw which is light in weight.

Another object is to provide a hollow tubular clamping jaw which is suitably ribbed and reinforced so as to be extremely 3o durable despite decreased weight.

Another object is to so dispose the ribs in the tubular jaw arms that they strengthen againsttorques resulting from the working thrusts upon the extreme outer ends of the jaws. f n

Other objects and certain advantages will be more fully set forth in the description of the accompanying drawing forming a partof this specification, in which: p

lligure 1 is a side elevation of a clamp cinbodying the present invention.

Figure 2 is a sectional view taken on line 2-2, Figure 1, illustrating in detail the disposition of the ribs and apertures in a jaw. 4 l

Figure 3 is a sectional view. taken on line 3-3, Figure 2, further detailing the construction of the jaw. p

l Figure 4 is a sectional viewof the taken on line {1r-4, Figure 3.

Referring to the drawings, the clamp coinprises a longitudinal, rectangularbar 1 and a pair of jaws 2-3inounted thereon. The type of clainp in which the j aws vare used is of little importance in thisv invention, inasmuch as the invention is directed only to the j aw 1927. seriaiNo. 203,323.

construction 4of a clamping jaw. The jaws are shown assembled in a clamp inorder to` bring out` the directionfof thrusts. j i

`Describing the illustrated application of torques and thejaws, jaw 2 is shown as a st'litonary` jaw secured ,at one end of the longitudinal` rectangular bar 1 and jaw Bas an adjustable jaw sliding longitudinally ofthe bar in relation `to Athe fixed j, jaw. The stationary jaw 2 hasa screw4, threaded 'through the causes lateral thrusts on the screw,these being exerted in twisting strains on the jaw since the screw extends through its outer end of the jaw. The slidable jaw 3 has a faced portion 8 disposed iii line with the screw 1. The distance from Y the line of movement of the screw or the outer ends of the clamping jaws to the bar is somewhat great, in order that large objects may be conveniently manipulated and clamped between the jaws, this necessitating jaws of suiiicient tensile strength and properlyV disposed reinforcing.

As shown in Figures 2, 3 and 4, the jaw is tubular, comprising apertured walls, and interiorly disposed ribs. The ribs 9 are disposed parallel to the bar engaging bore 10 and divide the tubular jaw into a series of cavities 13. These ribs 9 join the four walls of the tubular jaw at numerous points. The inner end wall 12 of the jaw is wider than the body of the jaw so as to provide a bead extending around the entire jaw.

Through each of the cavities 13 formed by the series of ribs 9, pairs of apertures 14 are provided. These apertures 14 are in both side walls 11 of the jaw and are of less dimension than the distance between the ribs. As shown in Figure 2, this dimensionstrengthening the structure by joining the side walls and solid inner face of the jaw at a series of: point-s. The outer wall 12a of the jaw is apertured as at 17 entering into each cavity for lightening the structure, these apertures leaving the widened portions 18 where the ribs join the outer wall 12 The various apertures in the walls for lightening the Weight of the jaw are disposed so as not to weaken the jaw structure. The leaving of wall ortions at the points Where the ribs join tie side wall ad]acent the apertures as at 15 provides eye beam crosssections at these points (see Figure 2) so that the jaws are trussed throughout their length against twisting strainsl By this hollowing out, recessing and ribbing of the jaw, a jaw of greater general thickness is produced without too much weight.

Having described my invention, I claim:

1. A clamp jaw, comprising, a work cngaging end, lan opposite end having a slide bar engagingbore therein, and a tubular intermediate arm portion having therein a series of ribs disposed parallel to the bar engaging bore.-

2. A clamp jaw, com rising, a work-engaging end, a bored sli e bar engaging inner end, and an intermediate hollow arin portion having a series of ribs disposed therein parallel to the barrengaging the inner jaw end, and the side Walls of said arm portion apertured between the ribs.

3. A clainp jaw, comprising, a work engaging end, a slide bar engaging end, and an intermediate arin portion comprising side walls and a. series of reinforcing ribs joining said Walls.

4. A clainp jaw, comprising, a tubular arm portion, a work engaging end and a mounting end, a series of ribs disposed within the arm parallel to the direction of direct load thrust on the jaw outer end and crosswise in the arm, and the side Walls of said arin portion having apertures between the ribs of less width than the distance between said ribs, a portion of said side walls extending out at each side of the ends of the ribs, forming a series of truss points in the jaw structure.

In Witness whereof, I hereunto subscribe my name.

JOHN M. HARGRMHQ.` 

